—You should be careful when .—Yes I will. I’d like to know when to have a rest.A. drivin

问题补充：

—You should be careful when .

—Yes, I will. I’d like to know when to have a rest.

A. driving; stopping

B. driving; to stop

C. to drive; stopping

D. to drive; to stop

答案：

A. driving; stopping

(答案→)B. driving; to stop

C. to drive; stopping

D. to drive; to stop

解析：本题考查非谓语动词。第一空考查现在分词作状语，drive与逻辑主语you为主动关系；第二空为V + 特殊疑问词 + to do结构。句意：——当开车的时候，你应当小心。——是的，我会的。我想知道什么时候停下来休息会儿。